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224 lines
5.7 KiB
224 lines
5.7 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* GPD Pocket fan controller driver |
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* |
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* Copyright (C) 2017 Hans de Goede <[email protected]> |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/devm-helpers.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/platform_device.h> |
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#include <linux/power_supply.h> |
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#include <linux/thermal.h> |
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#include <linux/workqueue.h> |
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#define MAX_SPEED 3 |
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#define TEMP_LIMIT0_DEFAULT 55000 |
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#define TEMP_LIMIT1_DEFAULT 60000 |
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#define TEMP_LIMIT2_DEFAULT 65000 |
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#define HYSTERESIS_DEFAULT 3000 |
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#define SPEED_ON_AC_DEFAULT 2 |
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static int temp_limits[3] = { |
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TEMP_LIMIT0_DEFAULT, TEMP_LIMIT1_DEFAULT, TEMP_LIMIT2_DEFAULT, |
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}; |
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module_param_array(temp_limits, int, NULL, 0444); |
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MODULE_PARM_DESC(temp_limits, |
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"Millicelsius values above which the fan speed increases"); |
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static int hysteresis = HYSTERESIS_DEFAULT; |
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module_param(hysteresis, int, 0444); |
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MODULE_PARM_DESC(hysteresis, |
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"Hysteresis in millicelsius before lowering the fan speed"); |
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static int speed_on_ac = SPEED_ON_AC_DEFAULT; |
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module_param(speed_on_ac, int, 0444); |
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MODULE_PARM_DESC(speed_on_ac, |
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"minimum fan speed to allow when system is powered by AC"); |
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struct gpd_pocket_fan_data { |
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struct device *dev; |
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struct thermal_zone_device *dts0; |
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struct thermal_zone_device *dts1; |
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struct gpio_desc *gpio0; |
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struct gpio_desc *gpio1; |
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struct delayed_work work; |
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int last_speed; |
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}; |
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static void gpd_pocket_fan_set_speed(struct gpd_pocket_fan_data *fan, int speed) |
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{ |
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if (speed == fan->last_speed) |
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return; |
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gpiod_direction_output(fan->gpio0, !!(speed & 1)); |
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gpiod_direction_output(fan->gpio1, !!(speed & 2)); |
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fan->last_speed = speed; |
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} |
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static int gpd_pocket_fan_min_speed(void) |
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{ |
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if (power_supply_is_system_supplied()) |
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return speed_on_ac; |
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else |
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return 0; |
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} |
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static void gpd_pocket_fan_worker(struct work_struct *work) |
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{ |
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struct gpd_pocket_fan_data *fan = |
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container_of(work, struct gpd_pocket_fan_data, work.work); |
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int t0, t1, temp, speed, min_speed, i; |
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if (thermal_zone_get_temp(fan->dts0, &t0) || |
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thermal_zone_get_temp(fan->dts1, &t1)) { |
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dev_warn(fan->dev, "Error getting temperature\n"); |
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speed = MAX_SPEED; |
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goto set_speed; |
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} |
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temp = max(t0, t1); |
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speed = fan->last_speed; |
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min_speed = gpd_pocket_fan_min_speed(); |
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/* Determine minimum speed */ |
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for (i = min_speed; i < ARRAY_SIZE(temp_limits); i++) { |
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if (temp < temp_limits[i]) |
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break; |
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} |
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if (speed < i) |
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speed = i; |
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/* Use hysteresis before lowering speed again */ |
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for (i = min_speed; i < ARRAY_SIZE(temp_limits); i++) { |
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if (temp <= (temp_limits[i] - hysteresis)) |
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break; |
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} |
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if (speed > i) |
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speed = i; |
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if (fan->last_speed <= 0 && speed) |
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speed = MAX_SPEED; /* kick start motor */ |
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set_speed: |
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gpd_pocket_fan_set_speed(fan, speed); |
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/* When mostly idle (low temp/speed), slow down the poll interval. */ |
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queue_delayed_work(system_wq, &fan->work, |
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msecs_to_jiffies(4000 / (speed + 1))); |
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} |
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static void gpd_pocket_fan_force_update(struct gpd_pocket_fan_data *fan) |
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{ |
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fan->last_speed = -1; |
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mod_delayed_work(system_wq, &fan->work, 0); |
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} |
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static int gpd_pocket_fan_probe(struct platform_device *pdev) |
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{ |
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struct gpd_pocket_fan_data *fan; |
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int i, ret; |
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for (i = 0; i < ARRAY_SIZE(temp_limits); i++) { |
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if (temp_limits[i] < 20000 || temp_limits[i] > 90000) { |
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dev_err(&pdev->dev, "Invalid temp-limit %d (must be between 20000 and 90000)\n", |
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temp_limits[i]); |
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temp_limits[0] = TEMP_LIMIT0_DEFAULT; |
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temp_limits[1] = TEMP_LIMIT1_DEFAULT; |
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temp_limits[2] = TEMP_LIMIT2_DEFAULT; |
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break; |
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} |
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} |
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if (hysteresis < 1000 || hysteresis > 10000) { |
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dev_err(&pdev->dev, "Invalid hysteresis %d (must be between 1000 and 10000)\n", |
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hysteresis); |
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hysteresis = HYSTERESIS_DEFAULT; |
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} |
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if (speed_on_ac < 0 || speed_on_ac > MAX_SPEED) { |
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dev_err(&pdev->dev, "Invalid speed_on_ac %d (must be between 0 and 3)\n", |
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speed_on_ac); |
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speed_on_ac = SPEED_ON_AC_DEFAULT; |
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} |
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fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL); |
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if (!fan) |
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return -ENOMEM; |
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fan->dev = &pdev->dev; |
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ret = devm_delayed_work_autocancel(&pdev->dev, &fan->work, |
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gpd_pocket_fan_worker); |
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if (ret) |
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return ret; |
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/* Note this returns a "weak" reference which we don't need to free */ |
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fan->dts0 = thermal_zone_get_zone_by_name("soc_dts0"); |
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if (IS_ERR(fan->dts0)) |
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return -EPROBE_DEFER; |
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fan->dts1 = thermal_zone_get_zone_by_name("soc_dts1"); |
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if (IS_ERR(fan->dts1)) |
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return -EPROBE_DEFER; |
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fan->gpio0 = devm_gpiod_get_index(fan->dev, NULL, 0, GPIOD_ASIS); |
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if (IS_ERR(fan->gpio0)) |
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return PTR_ERR(fan->gpio0); |
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fan->gpio1 = devm_gpiod_get_index(fan->dev, NULL, 1, GPIOD_ASIS); |
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if (IS_ERR(fan->gpio1)) |
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return PTR_ERR(fan->gpio1); |
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gpd_pocket_fan_force_update(fan); |
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platform_set_drvdata(pdev, fan); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int gpd_pocket_fan_suspend(struct device *dev) |
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{ |
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struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev); |
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cancel_delayed_work_sync(&fan->work); |
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gpd_pocket_fan_set_speed(fan, gpd_pocket_fan_min_speed()); |
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return 0; |
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} |
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static int gpd_pocket_fan_resume(struct device *dev) |
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{ |
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struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev); |
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gpd_pocket_fan_force_update(fan); |
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return 0; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(gpd_pocket_fan_pm_ops, |
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gpd_pocket_fan_suspend, |
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gpd_pocket_fan_resume); |
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static struct acpi_device_id gpd_pocket_fan_acpi_match[] = { |
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{ "FAN02501" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, gpd_pocket_fan_acpi_match); |
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static struct platform_driver gpd_pocket_fan_driver = { |
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.probe = gpd_pocket_fan_probe, |
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.driver = { |
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.name = "gpd_pocket_fan", |
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.acpi_match_table = gpd_pocket_fan_acpi_match, |
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.pm = &gpd_pocket_fan_pm_ops, |
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}, |
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}; |
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module_platform_driver(gpd_pocket_fan_driver); |
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MODULE_AUTHOR("Hans de Goede <[email protected]"); |
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MODULE_DESCRIPTION("GPD pocket fan driver"); |
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MODULE_LICENSE("GPL");
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